(#10614) Provide default metadata values for Windows ACLs

Previously, when sourcing file content from a volume that doesn't
support Windows ACLs, e.g. VMware shared drive, puppet would raise an
error.

This commit defaults the owner (Administrators), group (Nobody), and
mode (0644), so that content can be sourced without requiring the
owner, group, and mode to be specified in the manifest.

Paired-with: Nick Lewis <nick@puppetlabs.com>